Hyeonseong is a 2nd year Ph.D student in Graduate School of Information Security. He joined NSS lab in School of Computing at KAIST in March 2015. He received his M.S degree in information security at KAIST in 2017 and BS in Information computer engineering from Ajou University in 2015. His research interest is to find security issue of Software Defined Network. In his free time, he goes in for sports such as swimming or riding bicycle.